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Copolyether ester, elastic buffer member prepared thereby, preparation method of elastic buffer member, and rail traffic vehicle provided with elastic buffer member

A technology of copolyetherester and elastic buffering, which is applied to springs, buffers, and mechanical equipment made of plastic materials, can solve the problems of high cost, heavy weight and complex structure of buffers, and achieve high production efficiency and simple structure. , the effect of simple production process

Active Publication Date: 2014-05-21
ZHUZHOU TIMES NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of high cost, complex structure and heavy quality of existing buffers, the present invention provides a copolyether ester, which is composed of a polyester hard segment and a soft segment, and the soft segment is composed of polytetrahydrofuran The soft segment formed by ether and the soft segment formed by hydroxyl-terminated polybutadiene, and the mass ratio of the soft segment formed by polytetrahydrofuran ether to the soft segment formed by the hydroxyl-terminated polybutadiene is 3:1 -6:1, the hardness of copolyetherester is between Shore D40-80

Method used

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  • Copolyether ester, elastic buffer member prepared thereby, preparation method of elastic buffer member, and rail traffic vehicle provided with elastic buffer member
  • Copolyether ester, elastic buffer member prepared thereby, preparation method of elastic buffer member, and rail traffic vehicle provided with elastic buffer member
  • Copolyether ester, elastic buffer member prepared thereby, preparation method of elastic buffer member, and rail traffic vehicle provided with elastic buffer member

Examples

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preparation example Construction

[0026] The present invention also provides a method for preparing an elastic buffer, the method comprising the following steps: preparing the above-mentioned copolyether ester; then uniformly mixing the copolyether ester, a crosslinking agent, and a nucleating agent, and obtaining a film embryo by injection molding; The membrane embryo is further placed in a compression mold for compression molding. In the above preparation process, the copolyetherester and the crosslinking agent realize micro-crosslinking in the injection molding process. Through micro-crosslinking, the material itself forms a partial network structure, similar to the crosslinking of rubber, so that the formed elastic buffer has creep resistance, bending fatigue and outstanding chemical resistance.

[0027]Cross-linking agent refers to a substance that can act as a bridge between linear molecules so that multiple linear molecules can be cross-linked into a network structure. Usually, such molecules contain fu...

Embodiment 1

[0042] Example 1 (ratio of each component=100:80:24:6, polytetrahydrofuran ether: hydroxyl-terminated polybutadiene=4:1)

[0043] Dimethyl terephthalate (1941g), 1,4-butanediol (1552g), polytetrahydrofuran ether (465g), hydroxyl-terminated polybutadiene (116g), tetrabutyl titanate (20g), antioxidant Agent 1010 (8.2g) was added into the polymerization kettle, and the copolyether ester was obtained through transesterification and polycondensation. The reaction steps were the same as those of the comparative example, and will not be repeated here. After testing, the hardness of the copolyether ester is Shore D68, and the number average molecular weight Mn is 30000 (GPC test, solvent chloroform), copolyether ester and 0.02% dicumyl peroxide and 1% nano-montmorillonite Mix well, according to figure 1 The shape of the mold is injection molded, and the mold base is placed in the compression tooling (such as figure 2 shown), at a temperature of 80° C. and a pressure of 1000 kN, com...

Embodiment 2

[0044] Example 2 (ratio of each component=100:83:28:6.6, polytetrahydrofuran ether: hydroxyl-terminated polybutadiene=4.2:1)

[0045] Dimethyl terephthalate (1941g), 1,4-butanediol (1611g), polytetrahydrofuran ether (547g), hydroxyl-terminated polybutadiene (129g), tetrabutyl titanate (21.1g), anti Oxygen agent 1010 (8.5g) was added to the polymerization kettle, and copolyether ester was obtained through transesterification and polycondensation reaction. The hardness of the copolyether ester was Shore D60, and the number average molecular weight Mn was 33000 (GPC test, solvent chloroform), copolymerized Mix the ether ester with 0.15% dicumyl peroxide and 0.8% nano-montmorillonite evenly, and inject the mold base to make the mold base. The mold base is placed in the compression tooling and compressed for three cycles at a temperature of 150°C and a pressure of 2000kN. The samples of the buffer pads were obtained, and their properties are shown in Table 1.

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Abstract

The invention provides a copolyether ester, an elastic buffer member formed by the copolyether ester as well as a preparation method thereof, and a rail traffic vehicle provided with the elastic buffer member. The copolyether ester is composed of a polyester hard chain segment and a soft chain segment, wherein the soft chain segment is composed of a soft chain segment formed by polytetrahydrofuran ether and a soft chain segment formed by hydroxyl terminated polybutadiene; a mass ratio of the soft chain segment formed by the polytetrahydrofuran ether to the soft chain segment formed by the hydroxyl terminated polybutadiene is 3:1 to 6:1; and the hardness of the copolyether ester is between shore D40 and shore D80. The elastic buffer member provided by the invention has excellent creep resistance and bending fatigue resistance abilities, as well as outstanding resistance ability to chemicals; besides, the elastic buffer member is simple in structure and convenient in overhaul. In addition, the preparation method provided by the invention has the advantages of simple production technology, high production efficiency and higher qualification rate of products.

Description

technical field [0001] The invention relates to the field of preparation of copolyetherester elastomers, in particular to a copolyetherester with stable performance and suitable for use in rail transit vehicles, an elastic buffer made therefrom, and a preparation method thereof, and a copolyetherester equipped with the elastic buffer pieces of rail transit vehicles. Background technique [0002] In order to improve the ride comfort and safety of rail transit vehicles, reduce the impact force when the train stops, and reduce the damage to the car body, rail transit vehicles usually install buffers such as coupler buffers at the joints of the car body. The existing commonly used buffers in China mainly include the following types: steel spring buffers, rubber buffers, hydraulic buffers, etc. Although the above buffers basically meet the requirements of use, there are problems such as complex structure, heavy weight, and difficult maintenance. [0003] In addition to the above...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/676C08L67/02C08L67/06F16F1/36B61G11/00
Inventor 王文志张英伟刘爱学张志军黄安民邓凯桓
Owner ZHUZHOU TIMES NEW MATERIALS TECH
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